Superheater for steam-boilers.



PATBNTED JULY 9, 1907.

` o. ILLI. y

SUPBRHEATBR PoR STEAM BoILERs.

APPLICATION FILED NOV. 10,- 1908.

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- in the structure and in the combination of parts con- UNITED [STATES PATENT oEEroE.

OSCAR ILLI, OF SOHENECTADY. NEW YORK.

SUPRHIEATER .FOR STEAIMFBOILERS.

Specication of Letters Patent.

Patented July `e, 1907.

Application filed November 10,1906. Serial No. 342,829.

yheaters and to superheaters particularly designed or internally-fired steam boilers.

The main objectof the invention is to construct a superheater in connection with the hre-box and in a manher'such as to increase the eficiency oi the superheater. 3 Y

With these objects in view, the invention consists stituting the same substantially as herein described and claimed. Y

The accompanying drawing shows, lin vertical, longitudinal section, so much of a locomotive boiler as is Anecessary to illustrate Amy improvements and their application. l

Three sections of the boiler shell are presented at 3, 4 and 5, while the forward portion of thecab is indicated at 6. The fire-box, preferably corrugated, is represented at 7, and is attached h," the narrow ring,

.8, U-shaped in cross-section, to the rear end oi section 3, and to said ring is connected the face-plate with its fire-door, 9, draft-flap, l0, andash-door, ll. Extending irom the' face-plate to the bridge, 12, is the grate,

3, said bridge beingstayed to the face-plate as indicated at i4. The bridge consists, preferably, of a` casting, Ushaped in cross-section, in the channel of which and above the edges whereof, is formed or placed a ridge of fire-brick. Below the bridge is an opening into` the ash-space controlled by door, l5, having an operating rod, 16, which extends out through the aceplate within reach of the stoker. As a door to the ash space, a smooth plate 25 is provided and theash door is operated through lever 26 connected thereto by link 27 Into the forward end of the fire-box is built the superheater. For this purpose the lue-sheet,rl.7, is placed at some distance within the forward end of the firebox shell. The rear end -of the superheater is located a short distance in iront oi the Hue-sheet, as seen at A18,

thus providing a Water space between 'them whichcommunicates, through i perorations as indicated, with the water space around the fire-box. By this means the iue-sheetis kept from burning out and the circulation ofthe water in the boiler is facilitated. In

. the forward end o the fire-box shell, the 'otherlhead, 19, yof the superheater is placedand through these heads and the'space between entend the fire-tubes, 20, from the due-sheet iorward tothd smoke-box, the latter not being needed for disclosure of the invention is not shown.

`Into the .,superheater, the stea'm from the steam space is led by the pipe 2l and from it to the steamchests (not shown), bythe pipe 22. These pipes are preferably connected to the superheater by means of a casting, 23, to nipplesfin which, they are secured,

said nipples registering'with perforations in the wall of the superheater; as indicated..

, To pro'vide for intimate, extended and close contact o the steam with the fire-tubes, vertically disposed baie-plates Vare located between the -heads 'of the superheater and parallel therewith. They may be of any desired form and arrangement, by preference, however, two o the vertical plates at the middle of theA superheater extend to the top thereof and have horizontal plates extending therefrom to the iront thereof and to the rear thereof to within short distances of the heads of the superheater. .To the outer ends of these horizontal plates the rst and last of the vertical plates are connected. By this arrangement of the horizontal plates, an entrance chamber for the pipe 2l and an i exit' chamber for pipe 22, are formed. The intermediate bafile plates alternately abutand fall short of the bottom o the superheater vand said horizontal plates, thereby forming a sinuous pathdown and up, across the fire-tubes from the entrance at pipe 2l to the exit at pipe 22. The steam in traversing this pathl is heated to a very high degree, because brought into Contact with the hottest part of the bank of hre-tubes.

A suitable blow-off'for the superheater may be provided, preferably in the last compartment thereof, as indicated at 24. t

1. In a steam boiler, the combination with th'e dre-box shell extended beyond the due-sheet, of a superheater in snid'extension and traversed by the re-tubes.

L. in n steam boiler, the combination with the yirebox shell extended beyond the flue-sheet and having pedonisaid extension and traversedby the tire tubes, the interior'. of the super-heater being provided with vertically disposed barile-plates.

4. ln a steam boiler, the combination with the dre-box shell, of u fiue l 2 located Within its forward end thereby leaving.'l un extension oi. the shell beyond the flue-sheet and through which dre-tubes extend forward, the rear head of a superheuier located in said extension a. little forward of the flue-sheet and providing a water space between it and the tine-sheet, the other head of the superheater located at the forward edge of said extensionfand means for 'com ducting steam to and from the interior ofthe superheater so formed.

5. In a superheater traversed by re-t11bes, vertical plates at the middle thereof extending toits top, horizontal.

plates joined to said vertical plates and to other ,vertical pla-tes near the heads of tlie'superheater, and intermediate vertical plates alternately abutting and falling short of said horizontal plates and of the bottomof the superheatei'.

6. lIn an internally tired locomotive boiler, the combination with the lire-box shell extended beyond the flue-sheet,

10 of a superlieater built in said extension about the dre-tubes,

a casting secured to the top of the fire-box shell above the inlet and outlet chambers of the superheavter and provided with nipplesfcommunicating with said chambers consti-v tuting the inlet and outlet of the superheater, and pipes attached to these nipples and lying in the steam space oi. the boiler.

l l OSCAR ILLI. Witnesses:

Gno. C. Moon, EARL W. CLUTE, 

